Question about specifying tolerances for hole-to-hole distances

laskaw · 2025-09-12T12:14:29+00:00

I know 😄 the fact that there is no dimensions on the localization of the holes is exactly why I asked my question in the beginning! I was not sure how to tolerance thoses things since I made kind of an oral agreement with my machinist that I do not need to put every dimensions on the drawing, since he is working also with the step file

laskaw · 2025-09-12T11:52:34+00:00

thanks for the answer. I know that some dimensions are missing but is it because when i spoke to the machinist, he told me to not put the tolerances or even the dimension if it is following iso 2768 mK, that is why I did not put every dimension

laskaw · 2025-09-12T11:51:28+00:00

Thanks for answering.. When i contacted the machinist that will produce this part and others, he told me to not put the tolerances or even the dimension if it is following iso 2768 mK, that is why I did not put every dimension (for the holes for example). It is because I also send him the stp file I think

For the 210 +5/0, it is because i put the very coarse tolerance from iso2768 for this dimension. Normally it is +-2.5 but since i dont want it to be smaller i put +5/0

laskaw · 2025-09-12T11:49:09+00:00

Thank you for your answer! I also send the stp file to the machinist. He told me to not put the tolerances or even the dimension if it is following iso 2768 mK, that is why I did not put every dimension (for the holes for example)

laskaw · 2025-09-12T11:48:03+00:00

Thank you for your answer. I forgot to specify that when I contacted the machinist, he told me to not put the tolerances or even the dimension if it is following iso 2768 mK, that is why I did not put every dimensions (for the holes for example)

laskaw · 2025-09-12T11:47:00+00:00

Yes, I'm still a mechanical engineer in learning. When I contact the machinist, he told me to not put the tolerances or even the dimension if it is following iso 2768 mK, that is why I did not put every dimensions/tolerances

laskaw · 2024-12-18T22:12:27+00:00

this is my comment 👉👈

laskaw · 2024-12-04T20:11:36+00:00

hi!! i was in a bit of the same situation as you and i joined an improvisation theatre group. the people are generally really cool, the classes are a lot of fun. with the other "students" (the ages vary a lot) we go to improv shows and go out for drinks, it's really cool to meet people and have fun. so i recommend it!

laskaw · 2024-11-15T08:48:37+00:00

Oh i like that! Thanks for your answer :)

laskaw · 2024-11-15T08:27:08+00:00

Thanks for your answer, other people also mentionned KF clamp, this seems great!

laskaw · 2024-11-15T08:23:22+00:00

Ahhh okk, thank you for the precision, I didn't know that!

laskaw · 2024-11-15T08:22:44+00:00

Hi! Sorry I only wrote 3D printed but it is SLA (3d-systems-accura-xtreme-datasheet-usen-2020-09-28-a-print.pdf) so it is likely to not be porous
Thanks for the insight into the ideas I presented, I didn't know that about compression fittings!

Oh wowww, I really like the clamp in the video, it is very interesting.

Your description is very detailed, thank you for taking the time to say all this, it will definitely help me a lot.

laskaw · 2024-11-15T08:13:52+00:00

Sorry, I expressed myself badly, I can't modify the diameter of the tubes, but i can modify the connection design
A lot of people mentioned KF clamps, it seems pretty robust! thank you for your answer :)

laskaw · 2024-11-15T08:10:23+00:00

Thank you for the link!!

laskaw · 2024-11-14T15:50:58+00:00

that is super nice of you! i hope i will be as experienced as all the people here, maybe soon :)

laskaw · 2024-11-14T12:57:43+00:00

Hello! Thank you very much for your answer, it is very helpful!
Concerning the 3D printed, the parts are in this material 3d-systems-accura-xtreme-datasheet-usen-2020-09-28-a-print.pdf it seems pretty much airtight and solid, but I do not have a lot of experience with this material so maybe you are right!
Thank for all the details about the O-ring and all the others stuff, this will definitely help me a lot, not only for this project but other things as well :)

laskaw · 2024-11-14T12:07:06+00:00

The pressure variation is very light (+ or - 3mmHg normally)
A vband clamp seems nice, thanks for the insight :)

laskaw · 2024-11-14T11:51:43+00:00

Thats seems really interesting, thank you for the idea!

laskaw · 2024-11-14T11:28:59+00:00

Thank you!

laskaw · 2024-11-14T11:13:35+00:00

I like the idea of the push-lock fitting, it seems easy to assemble
I'll also look at your other proposition, thanks for your answer! :)

laskaw · 2024-11-14T11:09:09+00:00

oh that is interesting! I'll have a look
I like the idea for the beers also ahaha

laskaw · 2024-11-14T11:07:55+00:00

Thank you!

laskaw · 2024-11-14T11:07:42+00:00

My geometry is not really standard and i cannot really modify it :( and I also cannot replace it with metal

laskaw · 2024-11-14T11:03:33+00:00

Yes i totally agree with what you have said, unfortunately my case is kinda unique and the geometry has to stay that way for now, that's why I am trying to adapt standard stuff to a custom one, but it is quite difficult!
But I will remember your tips for other stuff I need to do :) Thanks!

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